I once read a post on Answering-Islam about the Height of Adam, and it said that the Islamic view of Adam was simple Muhammad copying the Jewish stories/belief's about Adam. As I don't know what stories could possibly be told (nor how to understand them) about Adam and his 'stature', I thought it best to come to the source.

@NewAlexandria How do you know the giants were of such stature? How do you know Adam was pure? How do you know purity==height?
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Double AA♦Dec 23 '12 at 18:58

@DoubleAA I agree these are good questions. I will look to find good sources that can illuminate the discussion. Mostly, I think I have jump beyond conclusion to think that a large stature is concomitant with purity.
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ZachariahDec 24 '12 at 3:08